Outlet-box.



KEEFE. 'OUTLET BOX.

APPLICATION FILED OO'I.17, 1910.

1,639,955, Patented 0013.1, 1912 t ii TED STATES: rAlENr oFEIoi-i.

acsnrn: Kaars, or Boeren, MASSACHUSETTS; .assitance vTo Jorrit n. Pannen. orf

' saueusivmssecrrusnrre. i '4 currar-non.

anaemia.`

To all whom it my concern:

Be it known that I, JOSEPH Kenra, of

vBoston, in the dounty of Suolk and State of Massachusett have invented a new and useful Outlet-Box, of which the following is a specification.

My invention relates to 'that branch of electrical work in which voutlet boxes are used and the main object ctn/1y invention is inwardly in the outlet for gripping the conduit.

A feature of my invention is two sets'of projections extending inwardly in each outlet, one setfextending farther inwardI than the other set.

In the drawings Figure 1 is a plan of an outlet box embodying my invention; Fig. 2 is a broken section of the same on line 2'2 of Fig. l; Fig. 3 is aplan of a detail of a modification; and Fig. et is a section on line 4-4 of Fig. 3. y

Box A has earsv or tongues a; @projecting inwardly from the corners of the sides A A. of the box; Walls B B have projections l5 Zi which engage the ears a and thereby hold the walls in place. At suitable locations I provide outlets. In these outletsv I provide one set of teeth a7. d extending inwardly into the outlet holes and another set d d which also extend inwardly but farther wit-hin the outlets t-han the first set. In Figs. 1 and 2 both sets of teeth are integral with the box while in Figs. 3' and l they extend inwardly from aring (Z2 wedged in a hole d3 1n the box. I prefer to make the longer teeth thinner and therefore more yielding than the shorter' teeth so that if I use a conduit of larger circumference thanthe circle outlined by the points of the longer/teeth said points may i be bent out of the way and engagementhad such engagement.

speciadauon or Letters raient. Application filed ctnfber 17, 1910. Serial No. 58'?,65.

sentences. i, rara;

line of the sets of teeth. This knockout por# tion may be wedged or cemented in place or may be only partially removed when the.v box is made or it may be arranged in eff variety of ways. A slight blow of a hareng@ mer or other vtool will remove the knockoutl portion when desired. I While a knockout is a useful form of clo'f'f' sure I sometimes prefer a closure in the form" oa sliding barrier F which is held in4 po sitlon by gibs 'f fon the box. In the .p ticular form of box shown I prefer to "rel the partition arend wall B at h. so thati a barrier F is used as a closure for anion let in the side A. of the box the upper. wa p of said recess will engage the top ofthe-1 barrier F and hold it in position it clear that the member B may 'be readil ott when the barrier is to be remove vn A l slid into position again after such rein ya j?. y

An important advantage of my box is t" at without `any change in parts it is adapted for use with diderent sizes of conduits. Anx* other advantage'is that I providetecie'nt..

conduit-holding means in a cheap and duraeail i ble box. l y

Although I have described alcove certain features ot end wall and barrier construction'j f which are inventionaily newwith me' I doeg..k i? not claim them in this application because 5&2*

tion. A

WhatIclaim is: E@

1. An outlet boxfcomprising a wall'iwthj'f. an opening; andv two sets of'projections, their?? first set including two projections opposedvv to each other across said openings-nd eige".

they form the subject ot another applica tending partially across said openingto grip a conduit of one size. andthe second Set including two projections opposed to each mi* otherV across said opening and extendinr." farther across said openin than thefsai l two projections ot: the first set to la, conduit oi. a sinallersize. 2. An outlet box ,comprising'an opening-' with two sets of teeth projecting inwardlyfrom its wall, the points oir one set of teeth being farther inward in the opening than, the points of the other set;4 and a pluggtn lill the opening and having'recesses to :ttt said teeth. l I 3. An' outlet box comprising an opening; a member held within that opening' itself having a central opening with twosets ci? 'teeth-projecting inwardly7 the pointent one 1w" set of teeth being farther ,inward in the ing farther across said opening'n than the' central opening than the points of the other other set and being relatively more yielding set; and a plug to fill the opening and havthan the other set. ing recesses to it said teeth.

JOSEPH KEEFE. 4. An outlet box comprising an opening Witnesses:

and having two sets of projections extending EBEN A. THAGHER,

partially aoross said opening, one set eXtendn Gr. A. ROGKWELL. 

